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Marius CiepluchandClaude Opus 4.8
81a63cf5ac
Written after five evolve rounds produced zero decisions distinguishable from noise, and after reading Clearwing, Big Sleep, and the AIxCC 2025 finals. The premise we got wrong: OpenUltraSAST treats the LLM as a noisy oracle to average (K runs), floor (noise budget), gate (sign test) and slowly improve (evolve loop). 120 runs produced 120 distinct trajectories -- the variance is the loop's freedom to search, not the model's uncertainty. And the premise is empirically false as a claim about LLMs: Big Sleep found a real SQLite zero-day in Nov 2024; AIxCC finalists uncovered 18 real 0-days across 54M LOC, with the 2nd-place system using non-reasoning LLMs at 90% accuracy and $181/point. The lever is architecture, not prompt optimization. What the winners share, and Clearwing is the open instance of: the LLM is a judgement layer on an execution substrate, and truth comes from the sandbox -- a crash, a sanitizer report, a patch that stops the crash -- not from a score against a labeled corpus. Clearwing's poc_runner (apply diff, recompile, re-run, does-the-crash-still-happen) replaces our entire noise architecture. We built K-runs because we had no ground truth; they generate their own. The course: adopt Clearwing as the substrate (the maintainer already forks it), delete the noise architecture rather than fix it, and contribute the one thing Clearwing lacks -- the web/logic detection path. Our IR candidate enumerator (12.1% ruleset vs 96.6% IR, measured) and our obligation/absence-bug checker reach the dangerous web bugs that never crash a sandbox, which Clearwing's crash-oracle model cannot. The open research problem is a differential oracle for those classes: the vulnerable-parent/fix-commit pair as ground truth, with a request the fixed version rejects and the vulnerable one serves. Recommendation is explicitly not to rebuild: eighteen defects this session, all ours, against a 19k-line battle-tested MIT substrate. Not approved. Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG